Nonablative allogeneic stem cell transplantation for chronic lymphocytic leukemia: impact of rituximab on immunomodulation and survival - Issa F. Khouri; Ming-Sheng Lee; Rima M. Saliba; Börje S. Andersson; Paolo Anderlini; Daniel R. Couriel; Chitra Hosing; Sergio Giralt; Martin Körbling; John D. McMannis; Michael J. Keating; Richard E. Champlin (2004)